SpringBoot接收前端请求参数
SpringBoot接收前端请求参数
1.前端GET请求的URL参数与Controller类中的方法的参数名称对应
@Controller
@RequestMapping(value = "/test")
public class IndexController {
@ResponseBody
@RequestMapping("/test1")
public String test(String username, String password){
String str = "username:" + username + ";" + "password:" + password;
return str;
}
}
2.通过HttpServletRequest来获取前端GET请求的参数
@Controller
@RequestMapping(value = "/test")
public class IndexController {
@ResponseBody
@RequestMapping("/test2")
public String test2(HttpServletRequest request){
String str = "username:" + request.getParameter("username") + ";" + "password:" + request.getParameter("password");
return str;
}
}
3.通过创建一个JavaBean对象来封装表单参数或者是请求url路径中的参数
@Controller
@RequestMapping(value = "/test")
public class IndexController {
@ResponseBody
@RequestMapping("/test3")
public String test3(User user){
String str = "username:" + user.getUsername() + ";" + "password:" + user.getPassword();
return str;
}
}
User类
public class User {
private Integer id;
private String username;
private String password;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username == null ? null : username.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
4.@PathVariable
定义单个URL变量
@ResponseBody
@RequestMapping("/test4/{username}")
public String userProfile(@PathVariable("username") String username){
return "user:" + username;
}
定义多个URL变量
@ResponseBody
@RequestMapping("/user/{username}/pwd/{password}")
public String test5(@PathVariable("username") String username , @PathVariable("password") String password){
return "user:" + username + ";" + "pwd:" + password;
}
用正则表达式精确定义URL变量
除了简单地定义{username}变量，还可以定义正则表达式进行更精确的控制，定义语法是{变量名：正则表达式}[a-zA-Z0-9_]+是一个正则表达式，表示只能包含小写字母，大写字母，数字，下划线。如此设置URL变量规则后，不合法的URL则不会被处理，直接由SpringMVC框架返回404Not Found。
@ResponseBody
@RequestMapping("/test6/{username:[a-zA-Z0-9_]+}/{password}")
public String test6(@PathVariable("username") String username , @PathVariable("password") String password){
return "user:" + username + ";" + "pwd:" + password;
}
5.@RequestParam
@ResponseBody
@RequestMapping("/test7")
public String test7(@RequestParam(value = "username", required = false, defaultValue = "null") String username , @RequestParam(value = "password", required = false, defaultValue = "null") String password){
return "user:" + username + ";" + "pwd:" + password;
}
6.@RequestBody
@RequestBody能把简单json结构参数转换成实体类
@ResponseBody
@PostMapping("/test8")
public String test8(@RequestBody User user){
String str = "user:" + user.getUsername() + ";" + "pwd:" + user.getPassword();
return str;
}
User类
public class User {
private Integer id;
private String username;
private String password;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username == null ? null : username.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
7.@ModelAttribute
@ResponseBody
@PostMapping("/test9")
public String test9(@ModelAttribute("user") User user){
String str = "user:" + user.getUsername() + ";" + "pwd:" + user.getPassword();
return str;
}
User类
public class User {
private Integer id;
private String username;
private String password;
private Integer age;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username == null ? null : username.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
